voodoohoodoo on "Accessing admin/finishing installation WP/123-Reg"

Yes, basically the deal is that they have an existing site already in use http://www.1stchoicedrivinglessons.co.uk. I am to make a new version of this site with wordpress, (up to date etc and easier to use) then transfer the above domain name to the new site. The domain name I am using for the new site at the moment is http://www.drivinglessonsbrightonhove.co.uk - only a temporary address to use so the current site is not down while I build the new one. Then I will transfer it over if you see what I mean.
The web forwarding is already in place i guess...during my installation when it says to click on http://www.drivinglessonsbrightonhove.co.uk to finish it just goes straight to http://www.1stchoicedrivinglessons.co.uk and nothing else.
It seems to be staring me in the face but I am still not 100% sure about this!